JP2016200729A - Zoom lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens that has: a high zoom ratio; high performance; a wide field angle; and further high optical performance over an entire zoom focus range.SOLUTION: A zoom lens includes, in order from an object side to an image side: a first lens group U1 having positive refractive power that does not move for zooming; a second lens group U2 having negative refractive power that moves during zooming; and a third lens group U3 having positive refractive power that moves during zooming. A distance between adjacent lens groups changes during zooming. The first lens group is composed of: a first a lens group that does not move for focusing; and a first b lens group that moves from the image side to the object side during focusing from an infinite object to an object at a close distance. The first a lens group has two positive lenses and two negative lenses.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a zoom lens and an image pickup apparatus having the same, and is suitable for, for example, a broadcast television camera, a video camera, a digital still camera, a surveillance camera, a silver salt photography camera, and the like.

  2. Description of the Related Art In recent years, zoom lenses having a wide angle of view, a high zoom ratio, and high optical performance have been demanded for imaging devices such as television cameras, silver salt film cameras, digital cameras, and video cameras.

  For example, Patent Document 1 discloses a positive first lens group, a second lens group having a negative refractive power that moves during zooming, a third lens group having a positive refractive power, and a fourth lens group that does not move for zooming. And a four-group zoom lens suitable for a television camera is disclosed. Further, focusing is performed by the partial lens group closest to the image side in the first group, and the partial lens group on the object side in the first group is fixed at the time of focusing.

  This Patent Document 1 discloses a zoom lens having a zoom ratio of about 65 times and a shooting angle of view of about 60 ° at the wide-angle end. A wide angle, high zoom ratio, and high performance can be achieved by appropriately arranging glass materials and lens configurations. Have achieved.

JP 2001-183484 A

  In the above-mentioned positive lead type zoom lens, in order to obtain high optical performance in the entire zoom all focus range while maintaining a wide angle of view and a high magnification, the configuration, refractive power, and focus method of the first lens group are required. It is important to set it properly. If these configurations are not set appropriately, it becomes difficult to obtain a zoom lens having a wide angle of view and a high zoom ratio and high optical performance over the entire zoom / focus range.

  In the zoom lens disclosed in Patent Document 1, as the magnification increases, the variation in axial chromatic aberration during zooming, the variation in axial chromatic aberration due to the change in object distance, and the change in peripheral performance at the telephoto end tend to increase. was there.

  An object of the present invention is to provide a zoom lens having a wide angle of view, a high zoom ratio and high optical performance over the entire zoom / focus range, and having a good zoom operation, and an image pickup apparatus having the zoom lens.

  In order to achieve the above object, according to the present invention, in order from the object side to the image side, a first lens group having a positive refractive power that does not move for zooming, and a second lens group having a negative refractive power that moves during zooming. In a zoom lens having a third lens unit having a positive refractive power that moves during zooming, the interval between adjacent lens units changes during zooming, and the first lens unit is a first lens unit that does not move for focusing, It is composed of a 1b lens group that moves from the object side to the image side during focusing from an infinity object to a short distance object, and the 1a lens group has two positive lenses and two negative lenses.

  According to the present invention, it is possible to obtain a zoom lens having a wide angle of view, a high zoom ratio and high optical performance over the entire zoom / focus range, and an image pickup apparatus having the zoom lens.

Lens sectional view of Numerical Example 1 at the wide-angle end and at infinity focus (A), (B) Aberration diagrams at the object distance of 15 m at the wide-angle end and the telephoto end of Numerical Example 1. Lens cross-sectional view of Numerical Example 2 at the wide-angle end and at infinity focus (A), (B) Aberration diagrams at the object distance of 15 m at the wide-angle end and the telephoto end of Numerical Example 2. Lens sectional view of Numerical Example 3 at the wide-angle end and at infinity focus (A), (B) Aberration diagrams at the object distance of 15 m at the wide-angle end and the telephoto end of Numerical Example 3. Lens sectional view of Numerical Example 4 at the wide angle end and at infinity focus (A) and (B) Aberration diagrams at the object distance of 15 m at the wide-angle end and the telephoto end in Numerical Example 4. Lens sectional view of Numerical Example 5 at the wide angle end and at infinity focus (A), (B) Aberration diagrams at the object distance of 15 m at the wide-angle end and the telephoto end of Numerical Example 5. Schematic diagram of main parts of an imaging apparatus of the present invention

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  The zoom lens of the present invention sequentially moves from the object side to the image side, a first lens unit having a positive refractive power that does not move for zooming, a second lens unit having a negative refractive power that moves during zooming, and a second lens unit that moves during zooming. A third lens unit having a positive refractive power;

  The lens group does not move for zooming because the lens group is not moved for the purpose of zooming, but if zooming and focusing are performed at the same time, the lens group moves for focusing. That is possible.

  FIG. 1 is a lens cross-sectional view of Example 1 (Numerical Example 1) of the present invention when focusing at infinity at the wide angle end. 2A and 2B are aberration diagrams when focusing on a distance of 15 m at the wide-angle end and the telephoto end of Numerical Example 1. FIG. However, the value of the object distance is a value when a numerical example described later is expressed in mm. The object distance is a distance from the first lens surface. The same applies hereinafter.

  FIG. 3 is a lens cross-sectional view of Example 2 (Numerical Example 2) of the present invention when focusing at infinity at the wide angle end. 4A and 4B are aberration diagrams when focusing on a distance of 15 m at the wide-angle end and the telephoto end of Numerical Example 2. FIG.

  FIG. 5 is a lens cross-sectional view of Example 3 (Numerical Example 3) of the present invention when focusing at infinity at the wide angle end. FIGS. 6A and 6B are aberration diagrams when the distance of 15 m is in focus at the wide-angle end and the telephoto end of Numerical Example 3. FIG.

  FIG. 7 is a lens cross-sectional view of Example 4 (Numerical Example 4) of the present invention when focusing at infinity at the wide angle end. 8A and 8B are aberration diagrams when focusing on a distance of 15 m at the wide-angle end and the telephoto end of Numerical Example 4. FIG.

  FIG. 9 is a lens cross-sectional view of Example 5 (Numerical Example 5) of the present invention when focusing at infinity at the wide angle end. FIGS. 10A and 10B are aberration diagrams when focusing on a distance of 15 m at the wide-angle end and the telephoto end according to Numerical Example 5. FIG.

  In each lens cross-sectional view, the left is the subject (object) side (front), and the right is the image side (rear). In the lens cross-sectional view, U1 is a first lens unit having a positive refractive power that does not move for zooming. U1b is a focus lens group in the first lens group U1, and moves to the object side during focusing adjustment from an object at infinity to a short distance object. U1a is a fixed lens unit that does not move for focusing in the first lens unit U1.

  U2 is a second lens unit having a negative refractive power that moves during zooming. U3 is a third lens unit having a positive refractive power that moves during zooming.

  In Examples 1, 2, 4, and 5, U4 is a fourth lens unit having a positive refractive power that moves during zooming. U5 is an image forming fifth lens group (relay lens group) that does not move for zooming.

  In Example 3, U4 is a fourth lens group (relay lens group) for imaging that does not move for zooming.

  The zoom lens of each embodiment corrects image plane variation associated with zooming and zooming by moving on the optical axis while changing the lens interval.

  IP is an image plane and corresponds to the imaging plane of a solid-state imaging device (photoelectric conversion device). In the spherical aberration diagram, the solid line indicates the e line and the two-dot chain line indicates the g line. In astigmatism, the dotted line indicates the e-line meridional image plane and the solid e-line sagittal image plane. In the lateral chromatic aberration, the two-dot chain line indicates the g-line. Fno is an F number, and ω is a half angle of view (degrees).

  In the aberration diagrams, spherical aberration is 0.2 mm, astigmatism is 0.2 mm, distortion is 5%, and lateral chromatic aberration is 0.05 mm.

  The zoom lens according to the present invention is provided with a high zoom ratio, wide angle of view, and high optical performance over the entire zoom / focus range by defining the focus method of the first lens group and the lens configuration of the first lens group. Is stipulated.

  First lens group having a positive refractive power that does not move for zooming in order from the object side to the image side, a second lens group having a negative refractive power that moves during zooming, and a third lens having a positive refractive power that moves during zooming Has a group. Also, the distance between adjacent lens groups changes during zooming, and the first lens group moves from the image side to the object side during focusing from a infinity object to a short distance object. 1b lens group. Furthermore, the 1a lens group has two positive lenses and two negative lenses. Here, the 1a lens group may have three or more positive lenses or three or more negative lenses, but in this embodiment, the minimum number of lenses is required to solve the problem. An example of two positive lenses and two negative lenses is shown.

  With the above configuration, a zoom lens having a high zoom ratio, a wide angle of view, and high optical performance over the entire zoom / focus range is obtained.

  In each embodiment, the first lens group is composed of two lens groups, an object-side 1a lens group and an image-side 1b lens group, and the object-side 1a lens group does not move for focusing. The first-b lens group on the image side moves during focusing. Focusing is performed by moving from the image side to the object side during focusing from an object at infinity to a near object.

  At this time, due to focusing, the height of the on-axis light beam and the off-axis light beam fluctuates, thereby causing aberration fluctuations. The aberration variation generally increases as it goes to the telephoto side. In order to suppress this, it is necessary to suppress the amount of aberration generated in the 1a lens group on the object side, in which the variation in the light beam height is large. The aberration variation can be classified into aberration caused by chromatic aberration and reference wavelength.

  Since the 1a lens group includes two negative lenses and two positive lenses, the number of lens surfaces in the 1a lens group increases, and the amount of aberration generated on each surface in the 1a lens group can be suppressed. . In addition, a plurality of combinations of adjacent surfaces (convex surface and concave surface) that have close curvatures and cancel out aberrations (two surfaces and three surfaces and six surfaces and seven surfaces in the case of Example 1) can be provided. Since the combination can correct high-order aberrations, it is possible to satisfactorily correct the occurrence of aberrations in the first-a lens group from low-order aberrations to high-order aberrations by providing a plurality thereof.

  Furthermore, it is possible to bring the dispersion (abbe number νd) of the positive lens and the negative lens closer while maintaining aberration sensitivity and optical performance. Accordingly, the dispersion characteristics (partial dispersion ratio θgf) of the positive lens and the negative lens can be brought close to each other due to the selection of the glass material, and the chromatic aberration of the 1a lens group can be favorably corrected at all wavelengths.

  The zoom lens according to the present invention has, as a further feature, a high zoom ratio, a wide angle of view and a high optical performance over the entire zoom / focus range by defining the lens configuration after the fourth lens group and the refractive power of the lens group. The conditions for obtaining a zoom lens having By adopting a configuration including a fourth lens unit having a positive refractive power that moves during zooming, a fifth lens unit for imaging, and a fourth lens unit for imaging after the fourth lens unit. A high zoom ratio can be achieved while maintaining the entire lens length.

  As a further feature of the zoom lens of the present invention, the ratio of the focal length of the negative lens of the lens group 1a and the ratio of dispersion of the lens material are defined. Thereby, it is possible to suppress the occurrence of chromatic aberration and various aberrations in the 1a lens group and to correct the occurrence of aberration due to focusing satisfactorily.

Of the two negative lenses in the lens group 1a, the focal length of the negative lens arranged on the object side is fn1, the Abbe number is νn1, the focal length of the negative lens arranged on the image side is fn2, and the Abbe number is When νn2, the following conditional expression is satisfied.
0.30 <fn1 / fn2 <2.50 (1)
0.30 <νn1 / νn2 <2.70 (2)

Here, the Abbe number is Nd, NF, NC when the refractive indexes for the F line (486.1 nm), d line (587.6 nm), and C line (656.3 nm) of the Fraunhofer line are Nd, NF, and NC, respectively.
νd = (Nd−1) / (NF−NC)
It is represented by

  When the lower limit of conditional expression (1) is exceeded, the refractive power of the negative lens disposed on the object side where the height of the off-axis light is large becomes strong, and distortion and field curvature on the wide angle side deteriorate. In addition, the sensitivity of spherical aberration and the like in the 1a lens group increases. When the upper limit of conditional expression (1) is exceeded, the refractive power of the negative lens disposed on the object side becomes weak, making it difficult to retrofit the first lens group and making it difficult to reduce the size. In addition, the refractive power of the negative lens arranged on the image side becomes strong, and the sensitivity such as spherical aberration in the first lens group increases.

  When the lower limit of conditional expression (2) is exceeded, the dispersion of the negative lens arranged on the object side where the off-axis ray height is large becomes strong, and the negative lens arranged on the image side where the off-axis ray height is small. Dispersion becomes weak and it becomes difficult to achieve both correction of axial chromatic aberration and lateral chromatic aberration. When the upper limit of conditional expression (2) is exceeded, the dispersion of the negative lens arranged on the object side where the off-axis ray height is large becomes weak, and the negative lens arranged on the image side where the off-axis ray height is small Dispersion becomes strong and it becomes difficult to achieve both correction of longitudinal chromatic aberration and lateral chromatic aberration.

More preferably, conditional expressions (1) and (2) should be set as follows.
0.40 <fn1 / fn2 <1.90 (1a)
0.35 <νn1 / νn2 <2.50 (2a)

  As a further feature of the zoom lens according to the present invention, by defining the ratio of the focal length of the negative lens of the 1a lens group to the focal length of the first lens group, the occurrence of various aberrations of the 1a lens group is suppressed. Stipulates conditions for satisfactorily correcting the occurrence of aberrations due to focusing.

When the focal length of the first lens group is f1, the following conditional expression is satisfied.
1.30 <| fn1 / f1 | <5.00 (3)
1.50 <| fn2 / f1 | <6.00 (4)

  When the lower limit of conditional expression (3) is exceeded, the refractive power of the negative lens arranged on the object side where off-axis rays are high becomes strong, and distortion and curvature of field on the wide angle side worsen. In addition, the sensitivity of spherical aberration and the like in the 1a lens group increases. When the upper limit of conditional expression (3) is exceeded, the refractive power of the negative lens disposed on the object side becomes weak, making it difficult to retrofit the first lens group and making it difficult to reduce the size.

  When the lower limit of conditional expression (4) is exceeded, the refractive power of the negative lens arranged on the image side becomes strong, and the sensitivity such as spherical aberration in the first lens group increases. If the upper limit of conditional expression (4) is exceeded, the refractive power of the negative lens disposed on the object side becomes weak, making it difficult to correct chromatic aberration and various aberrations in the first lens group, and generating aberrations due to focusing. Increase.

More preferably, conditional expressions (3) and (4) should be set as follows.
1.60 <| fn1 / f1 | <4.50 (3a)
1.70 <| fn2 / f1 | <4.70 (4a)

  As a further feature of the zoom lens according to the present invention, by defining the conditions of the dispersion characteristics of the lens material of the lens group 1a, the axial chromatic aberration variation due to focusing, the axial chromatic aberration due to zooming, and the lateral chromatic aberration variation are improved. The conditions for correction are specified.

Among the lenses constituting the 1a lens group, the Abbe number of the positive lens and the average value of the partial dispersion ratio are νpa and θpa, and the Abbe number of the negative lens having the largest Abbe number among the negative lenses constituting the 1a lens group When the partial dispersion ratio is νnx and θnx, the following conditional expression is satisfied.
−0.50500 × 10 ⁻³ <(θpa−θnx) / (νpa−νnx) <0.20000 × 10 ⁻³ (5)

Here, the partial dispersion ratio is Ng when the refractive index of the Fraunhofer line to the g-line (435.8 nm) is Ng.
θ = (Ng−NF) / (NF−NC)
It is represented by

  If the lower limit of conditional expression (5) is exceeded, the effect of correcting the chromatic aberration by the lens group 1a will be insufficient, and it will be difficult to satisfactorily correct the change in axial chromatic aberration due to focusing, the change in axial chromatic aberration due to zooming, and the change in lateral chromatic aberration. It becomes. If the upper limit of conditional expression (5) is exceeded, the selection of the glass material is limited, so that the dispersion of the positive lens and the negative lens of the 1a lens group becomes close, and the refractive power of each single lens of the 1a lens group increases. As a result, it is difficult to satisfactorily correct coma variation due to focusing.

More preferably, conditional expression (5) should be set as follows.
−0.50000 × 10 ⁻³ <(θpa−θnx) / (νpa−νnx) <0.100000 × 10 ⁻³ (5a)

As a further feature of the zoom lens of the present invention, by defining the focal lengths of the first lens group and the second lens group, conditions for achieving good correction of aberrations in the entire zoom range with high magnification are defined. ing. When the focal length of the second lens group is f2, the following conditional expression is satisfied.
6.00 <| f1 / f2 | <13.00 (6)

  If the upper limit of conditional expression (6) is exceeded, the focal length of the first lens group becomes relatively long, so that the lens diameter of the first lens group becomes large and it is difficult to widen the angle. If the lower limit of conditional expression (6) is exceeded, the focal length of the first lens group becomes relatively short, and it becomes difficult to correct spherical aberration fluctuations and axial chromatic aberration on the telephoto side.

More preferably, conditional expression (6) should be set as follows.
7.50 <| f1 / f2 | <11.00 (6a)

  As a further feature of the zoom lens of the present invention, the composite focal length of the negative lens of the 1a lens group, the composite focal length of the positive lens of the 1a lens group, and the ratio of the focal length of the first lens group are defined. . As a result, the occurrence of various aberrations in the first-a lens group can be suppressed, and the occurrence of aberrations due to focusing can be favorably corrected.

Of the lenses constituting the first lens group, the following conditional expression is satisfied, where fpa is the combined focal length of the positive lens and fna is the combined focal length of the negative lens.
0.75 <| fna / fpa | <1.30 (7)
1.00 <| fna / f1 | <2.00 (8)
1.00 <| fpa / f1 | <2.20 (9)

However, the combined focal length fx of the plurality of lenses is expressed as follows when the focal lengths of the plurality of lenses are f1, f2, f3.
1 / fx = 1 / f1 + 1 / f2 + 1 / f3 +...

  When the lower limit of conditional expression (7) is exceeded, the refractive power of each single lens in the 1a lens group becomes strong, and it becomes difficult to correct spherical aberration and coma at the telephoto end. In addition, the sensitivity of spherical aberration and the like in the 1a lens group increases. When the upper limit of conditional expression (7) is exceeded, achromaticity in the 1a lens group becomes insufficient, and variations in chromatic aberration due to focusing increase.

  If the lower limit of conditional expression (8) is exceeded, the refractive power of the negative lens will increase, and distortion and curvature of field on the wide angle side will deteriorate. In addition, the sensitivity of spherical aberration and the like in the 1a lens group increases. If the upper limit of conditional expression (8) is exceeded, achromaticity in the 1a lens group will be insufficient, and variations in chromatic aberration due to focusing will increase.

  If the lower limit of conditional expression (9) is exceeded, the refractive power of the positive lens will increase, making it difficult to correct spherical aberration and coma at the telephoto end. In addition, the sensitivity of spherical aberration and the like in the 1a lens group increases. When the upper limit of conditional expression (9) is exceeded, achromaticity in the 1a lens group becomes insufficient, and fluctuations in chromatic aberration due to focusing increase.

More preferably, conditional expressions (7), (8) and (9) should be set as follows.
0.85 <| fna / fpa | <1.10 (7a)
1.10 <| fna / f1 | <1.70 (8a)
1.10 <| fpa / f1 | <1.90 (9a)

  Next, features of each embodiment will be described.

  In the lens cross-sectional view of Example 1 of FIG. 1, U1 is a first lens unit having a positive refractive power that does not move for zooming. U1 has, in order from the object side to the image side, a 1a lens unit U1a that does not move for focusing, and a 1b lens unit U1b that moves during focusing. The focusing U1b moves to the object side as the object distance changes from a long distance to a short distance when focusing from an object at infinity to a short distance object.

  U2 and U3 are a second lens group having a negative refractive power and a third lens group (variator lens group) having a positive refractive power that move during zooming. These U2 and U3 move on the optical axis to perform zooming from the wide-angle end to the telephoto end. U4 is a fourth lens group (compensator lens group) having a positive refractive power that moves during zooming. This U4 moves on the optical axis in conjunction with the movement of U2 and U3, and corrects the image plane fluctuation accompanying the zooming. SP is an aperture stop. U5 is a fifth lens group (relay lens group R) having a positive refractive power that does not move during zooming. The aperture stop SP is disposed between U4 and U5.

  In this embodiment, all the conditional expressions (1) to (9) are satisfied, thereby obtaining a zoom lens having a high zoom ratio, high performance, and little deterioration in performance due to manufacturing errors.

  The zoom lens of Example 2 in FIG. 3 is the same as that of Example 1 in terms of the number of lens groups, the refractive power of each lens group, the moving conditions of each lens group during zooming, and focusing.

  This example satisfies all the conditional expressions, and as a result, the same effects as those of Example 1 are obtained.

  In the lens cross-sectional view of Example 3 in FIG. 5, U1 is a first lens unit having a positive refractive power that does not move for zooming. U1 has, in order from the object side to the image side, a 1a lens unit U1a that does not move for focusing, and a 1b lens unit U1b that moves during focusing. The focusing U1b moves to the object side as the object distance changes from a long distance to a short distance when focusing from an object at infinity to a short distance object.

  U2 is a second lens unit (variator lens unit) having a negative refractive power that moves during zooming. This U2 moves on the optical axis to change the magnification from the wide-angle end to the telephoto end. U3 is a third lens group (compensator lens group) having a positive refractive power that moves during zooming. This U3 moves on the optical axis in conjunction with the movement of U2, and corrects the image plane fluctuation accompanying zooming. SP is an aperture stop. U4 is a fourth lens group (relay lens group R) having positive refractive power that does not move during zooming. The aperture stop SP is disposed between U3 and U4.

  In this embodiment, all the conditional expressions (1) to (9) are satisfied, thereby obtaining a zoom lens having a high zoom ratio, high performance, and little deterioration in performance due to manufacturing errors.

  The zoom lens of the fourth embodiment shown in FIG. 7 has the same zoom type as that of the first embodiment, such as the number of lens groups, the refractive power of each lens group, the movement conditions of each lens group during zooming, and focusing.

  This example satisfies all the conditional expressions, and as a result, the same effects as those of Example 1 are obtained.

  The zoom lens of the fifth embodiment shown in FIG. 9 has the same zoom type as that of the first embodiment, such as the number of lens groups, the refractive power of each lens group, the moving conditions of each lens group during zooming, and focusing.

  This example satisfies all the conditional expressions, and as a result, the same effects as those of Example 1 are obtained.

  Further, the first lens unit U1a that does not move for focusing of the first lens unit U1 of each embodiment may have an aspherical surface. In the first-b lens unit U1b of each embodiment, the entire U1b may move to the object side as a single unit during focusing, or U1b may be divided into two bodies and move in a complex manner.

  An outline of an imaging apparatus (television camera system) using the zoom lens of each numerical example as a photographing optical system will be described with reference to FIG. FIG. 11 is a schematic diagram of a main part of the imaging apparatus of the present invention. In FIG. 11, reference numeral 101 denotes any one zoom lens of Numerical Examples 1 to 5. Reference numeral 124 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 124. An imaging apparatus 125 is configured by attaching the zoom lens 101 to the camera 124.

  The zoom lens 101 includes a first lens group F, a variable power lens group LZ, and a rear lens group R. The first lens group F includes a focus adjustment lens group. The zoom lens group LZ includes a group that moves on the optical axis during zooming and a group that moves on the optical axis to correct image plane fluctuations associated with zooming. The rear lens group R includes a lens group for forming an image with the aperture stop SP.

  Reference numerals 114 and 115 denote drive mechanisms such as helicoids and cams for driving the first lens group F and the variable power lens group LZ in the optical axis direction, respectively. Reference numerals 116 to 118 denote motors (drive means) that electrically drive the drive mechanisms 114 and 115 and the aperture stop SP. Reference numerals 119 to 121 denote detectors such as encoders, potentiometers, or photosensors for detecting positions on the optical axis of the first lens group F and the variable power lens group LZ and the aperture diameter of the aperture stop SP.

  In the camera 124, 109 is a glass block corresponding to an optical filter or color separation prism in the camera 124, and 110 is a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the zoom lens 101. ). Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 and the zoom lens body 101.

  Thus, by applying the zoom lens of the present invention to a television camera, an imaging device having high optical performance is realized.

  Numerical examples 1 to 5 corresponding to the first to fifth embodiments of the present invention are shown below. In each numerical example, i indicates the order of the surfaces from the object side, ri is the radius of curvature of the i-th surface from the object side, di is the i-th and i + 1-th distance from the object side, ndi, νdi Are the refractive index and Abbe number of the i-th optical member, respectively. BF is a back focus. The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, k is the cone constant, A4, A6, A8, A10, A12, When A14 and A16 are respectively aspherical coefficients, they are expressed by the following equations.

It is represented by For example, “e-Z” means “× 10 ^−Z ”. * Indicates an aspherical surface. Table 1 shows the correspondence between each example and the conditional expression described above.

(Numerical example 1)
Unit mm
Surface data Surface number rd nd vd θgF Effective diameter Focal length
1 1997.02113 6.00000 1.788001 47.37 0.5559 198.149 -452.598
2 303.49132 1.94485 1.000000 0.00 0.0000 190.591 0.000
3 317.22604 19.16858 1.433870 95.10 0.5373 190.378 698.448
4 -7044.93390 0.20000 1.000000 0.00 0.0000 190.784 0.000
5 673.24372 6.00000 1.834000 37.16 0.5775 192.043 -1014.711
6 374.48011 0.79177 1.000000 0.00 0.0000 191.537 0.000
7 345.92209 19.79827 1.433870 95.10 0.5373 192.283 687.598
8 -2170.21310 28.23869 1.000000 0.00 0.0000 192.596 0.000
9 339.68529 21.07732 1.433870 95.10 0.5373 195.863 648.526
10 -1632.16760 0.25000 1.000000 0.00 0.0000 195.374 0.000
11 246.79128 21.92714 1.433870 95.10 0.5373 190.003 593.790
12 5400.98293 1.20000 1.000000 0.00 0.0000 188.452 0.000
13 187.53643 11.51644 1.496999 81.54 0.5374 175.330 938.176
14 306.70197 (variable) 1.000000 0.00 0.0000 173.621 0.000
15 395.90619 2.35000 1.882997 40.76 0.5667 51.597 -55.978
16 44.04654 13.30679 1.000000 0.00 0.0000 44.829 0.000
17 -65.41206 1.45000 1.772499 49.60 0.5521 42.284 -42.531
18 67.29545 9.26401 1.808095 22.76 0.6307 42.341 44.835
19 -75.29841 3.29682 1.000000 0.00 0.0000 43.030 0.000
20 -53.59756 2.00000 1.696797 55.53 0.5433 42.991 -78.730
21 -2003.54268 (variable) 1.000000 0.00 0.0000 45.165 0.000
22 628.44661 9.76339 1.603112 60.64 0.5414 75.695 208.575
23 -157.12389 1.60214 1.000000 0.00 0.0000 77.204 0.000
24 221.58939 13.83425 1.438750 94.93 0.5343 79.745 201.114
25 -144.43270 10.00142 1.000000 0.00 0.0000 80.024 0.000
26 -1008.20057 2.50000 1.717362 29.50 0.6048 77.517 -124.649
27 99.08580 9.31604 1.438750 94.93 0.5343 76.804 258.044
28 757.73674 (variable) 1.000000 0.00 0.0000 77.029 0.000
29 142.05929 14.10652 1.593490 67.00 0.5361 78.216 127.579
30 -157.32117 (variable) 1.000000 0.00 0.0000 77.818 0.000
31 0.00000 4.90749 1.000000 0.00 0.0000 33.177 0.000
32 -72.13544 1.80000 1.816000 46.62 0.5568 31.587 -39.850
33 60.43089 5.13557 1.808095 22.76 0.6307 31.258 59.455
34 -237.28216 7.55722 1.000000 0.00 0.0000 31.109 0.000
35 -28.78125 1.49977 1.816000 46.62 0.5568 30.305 -24.953
36 72.49578 10.08032 1.548141 45.79 0.5685 33.631 38.544
37 -28.55262 16.01812 1.000000 0.00 0.0000 34.930 0.000
38 194.31854 9.07524 1.531717 48.84 0.5630 38.345 68.490
39 -44.35136 1.49161 1.000000 0.00 0.0000 38.448 0.000
40 -104.49421 1.50000 1.882997 40.76 0.5667 36.218 -38.029
41 50.24421 8.69548 1.518229 58.90 0.5456 35.615 45.865
42 -42.76309 0.49453 1.000000 0.00 0.0000 35.713 0.000
43 151.55145 6.51018 1.496999 81.54 0.5374 33.550 59.851
44 -36.61436 1.50000 1.882997 40.76 0.5667 32.980 -44.960
45 -449.26887 1.00055 1.000000 0.00 0.0000 32.726 0.000
46 79.39231 5.73260 1.522494 59.84 0.5439 32.255 83.857
47 -96.19591 10.00000 1.000000 0.00 0.0000 31.572 0.000
48 0.00000 33.00000 1.608590 46.44 0.5664 40.000 0.000
49 0.00000 13.20000 1.516330 64.14 0.5352 40.000 0.000
50 0.00000 0.00000 1.000000 0.00 0.0000 50.000 0.000

Aspheric data 15th surface
K = -2.45811e + 002 A 4 = 1.07978e-006 A 6 = -4.50940e-010 A 8 = 1.73915e-013
22nd page
K = -5.09046e + 001 A 4 = -2.37327e-007 A 6 = 3.54000e-012 A 8 = -1.42314e-015

Various data Zoom ratio 80.00
Wide angle Medium Telephoto focal length 10.00 89.41 800.00
F number 1.80 1.80 4.20
Angle of view 28.81 3.52 0.39
Image height 5.50 5.50 5.50
Total lens length 691.51 691.51 691.51
BF 14.63 14.63 14.63
d14 3.00 139.64 177.80
d21 289.00 115.12 2.88
d28 1.43 2.92 3.32
d30 13.35 49.10 122.78
d50 14.63 14.63 14.63
Entrance pupil position 155.45 1014.32 10584.39
Exit pupil position 11004.69 11004.69 11004.69
Front principal point position 165.46 1104.46 11442.62
Rear principal point position 4.63 -74.78 -785.37

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 246.00 138.11 81.41 -19.51
2 15 -28.50 31.67 7.77 -14.80
3 22 161.40 47.02 -4.26 -37.12
4 29 127.58 14.11 4.27 -4.73
5 31 60.37 139.20 60.71 7.60

(Numerical example 2)
Unit mm
Surface data Surface number rd nd vd θgF Effective diameter Focal length
1 1324.80625 22.32362 1.433870 95.10 0.5373 201.749 619.788
2 -336.72584 0.79968 1.000000 0.00 0.0000 199.468 0.000
3 -370.74012 6.00000 1.834000 37.16 0.5775 194.541 -789.254
4 -848.15632 0.20000 1.000000 0.00 0.0000 190.376 0.000
5 1733.64369 20.94068 1.433870 95.10 0.5373 189.840 607.866
6 -310.83471 2.61864 1.000000 0.00 0.0000 189.561 0.000
7 -298.28647 6.00000 1.772499 49.60 0.5521 188.690 -503.149
8 -1273.75329 30.35525 1.000000 0.00 0.0000 189.954 0.000
9 548.82791 18.46581 1.433870 95.10 0.5373 190.391 701.589
10 -680.33731 0.25000 1.000000 0.00 0.0000 190.046 0.000
11 333.29911 15.97422 1.433870 95.10 0.5373 184.668 765.659
12 -408110.84046 1.20000 1.000000 0.00 0.0000 183.614 0.000
13 194.97395 14.30085 1.496999 81.54 0.5374 172.382 709.696
14 423.79760 (variable) 1.000000 0.00 0.0000 170.447 0.000
15 419.69996 2.35000 1.882997 40.76 0.5667 47.312 -50.297
16 40.26779 11.98920 1.000000 0.00 0.0000 40.789 0.000
17 -50.83937 1.45000 1.772499 49.60 0.5521 38.920 -36.992
18 66.79636 9.04244 1.808095 22.76 0.6307 39.334 40.318
19 -60.94881 1.28069 1.000000 0.00 0.0000 40.183 0.000
20 -49.90479 2.00000 1.696797 55.53 0.5433 40.190 -79.704
21 -481.89320 (variable) 1.000000 0.00 0.0000 42.279 0.000
22 337.49438 8.60231 1.603112 60.64 0.5414 76.190 194.359
23 -178.94751 1.35642 1.000000 0.00 0.0000 76.928 0.000
24 164.89680 12.68381 1.438750 94.93 0.5343 78.861 193.472
25 -171.72108 0.46460 1.000000 0.00 0.0000 78.786 0.000
26 233.46660 2.50000 1.749505 35.33 0.5818 76.772 -186.036
27 87.25934 7.72445 1.438750 94.93 0.5343 74.595 306.167
28 241.16096 (variable) 1.000000 0.00 0.0000 74.275 0.000
29 122.51081 2.50000 1.846660 23.78 0.6205 73.869 -292.057
30 81.41636 14.66930 1.593490 67.00 0.5361 72.165 112.042
31 -345.13967 (variable) 1.000000 0.00 0.0000 71.183 0.000
32 0.00000 4.90749 1.000000 0.00 0.0000 33.126 0.000
33 -72.13544 1.80000 1.816000 46.62 0.5568 31.551 -39.850
34 60.43089 5.13557 1.808095 22.76 0.6307 31.235 59.455
35 -237.28216 7.55722 1.000000 0.00 0.0000 31.092 0.000
36 -28.78125 1.49977 1.816000 46.62 0.5568 30.304 -24.953
37 72.49578 10.08032 1.548141 45.79 0.5685 33.646 38.544
38 -28.55262 16.01812 1.000000 0.00 0.0000 34.946 0.000
39 194.31854 9.07524 1.531717 48.84 0.5630 38.448 68.490
40 -44.35136 1.49161 1.000000 0.00 0.0000 38.557 0.000
41 -104.49421 1.50000 1.882997 40.76 0.5667 36.327 -38.029
42 50.24421 8.69548 1.518229 58.90 0.5456 35.729 45.865
43 -42.76309 0.49453 1.000000 0.00 0.0000 35.828 0.000
44 151.55145 6.51018 1.496999 81.54 0.5374 33.663 59.851
45 -36.61436 1.50000 1.882997 40.76 0.5667 33.109 -44.960
46 -449.26887 1.00055 1.000000 0.00 0.0000 32.863 0.000
47 79.39231 5.73260 1.522494 59.84 0.5439 32.401 83.605
48 -95.55050 10.00000 1.000000 0.00 0.0000 31.731 0.000
49 0.00000 33.00000 1.608590 46.44 0.5664 40.000 0.000
50 0.00000 13.20000 1.516330 64.14 0.5352 40.000 0.000
51 0.00000 0.00000 1.000000 0.00 0.0000 50.000 0.000

Aspheric data 15th surface
K = -5.20835e + 002 A 4 = 1.54343e-006 A 6 = -1.02554e-009 A 8 = 6.38836e-013
22nd page
K = -2.95240e + 001 A 4 = -7.87902e-008 A 6 = -6.79761e-012 A 8 = 7.47662e-016

Various data Zoom ratio 80.00
Wide angle Medium Telephoto focal length 10.00 89.40 800.00
F number 1.80 1.80 4.20
Angle of view 28.81 3.52 0.39
Image height 5.50 5.50 5.50
Total lens length 674.53 674.53 674.53
BF 14.95 14.95 14.95
d14 2.65 136.33 174.96
d21 279.09 112.65 11.29
d28 14.34 7.83 1.48
d31 6.25 45.53 114.60
d51 14.95 14.95 14.95
Entrance pupil position 161.62 1023.49 10527.82
Exit pupil position 7811.22 7811.22 7811.22
Front principal point position 171.63 1113.91 11409.91
Rear principal point position 4.95 -74.45 -785.04

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 247.00 139.43 80.62 -27.10
2 15 -27.02 28.11 5.99 -14.22
3 22 120.36 33.33 2.96 -19.39
4 29 182.76 17.17 2.55 -8.14
5 32 60.14 139.20 60.60 7.42

(Numerical Example 3)
Unit mm
Surface data Surface number rd nd vd θgF Effective diameter Focal length
1 -5040.51292 6.00000 1.717004 47.92 0.5606 210.375 -565.252
2 443.32592 0.99823 1.000000 0.00 0.0000 203.264 0.000
3 432.21379 13.24440 1.433870 95.10 0.5373 202.957 1229.522
4 2232.40054 0.20000 1.000000 0.00 0.0000 201.877 0.000
5 597.02189 6.00000 1.850259 32.27 0.5929 199.277 -970.826
6 345.89840 2.30196 1.000000 0.00 0.0000 194.872 0.000
7 356.45839 25.67725 1.433870 95.10 0.5373 194.500 521.917
8 -611.48487 44.12339 1.000000 0.00 0.0000 193.447 0.000
9 332.28960 19.88688 1.433870 95.10 0.5373 194.591 716.228
10 -4896.15184 0.25000 1.000000 0.00 0.0000 193.840 0.000
11 312.99644 17.65657 1.433870 95.10 0.5373 189.613 746.308
12 8595.88869 1.20000 1.000000 0.00 0.0000 188.310 0.000
13 175.20052 14.81483 1.496999 81.54 0.5374 175.289 774.124
14 311.88029 (variable) 1.000000 0.00 0.0000 172.719 0.000
15 664.85120 2.35000 1.882997 40.76 0.5667 48.085 -50.572
16 42.00306 11.20017 1.000000 0.00 0.0000 41.784 0.000
17 -53.72304 1.45000 1.772499 49.60 0.5521 40.770 -36.234
18 59.72156 10.77698 1.808095 22.76 0.6307 43.957 43.022
19 -78.36637 0.86621 1.000000 0.00 0.0000 45.167 0.000
20 -70.23718 2.00000 1.696797 55.53 0.5433 45.250 -121.151
21 -414.26158 (variable) 1.000000 0.00 0.0000 47.209 0.000
22 212.31031 13.23565 1.603112 60.64 0.5414 79.327 133.849
23 -127.99792 0.20000 1.000000 0.00 0.0000 80.182 0.000
24 97.94547 14.21573 1.438750 94.93 0.5343 80.057 199.096
25 -790.29143 0.20000 1.000000 0.00 0.0000 78.777 0.000
26 260.22473 2.30685 1.805181 25.42 0.6161 76.974 -138.957
27 78.43639 10.85321 1.438750 94.93 0.5343 73.695 208.062
28 525.57155 1.48047 1.000000 0.00 0.0000 73.072 0.000
29 214.97173 6.65950 1.593490 67.00 0.5361 72.271 300.536
30 -1057.43892 (variable) 1.000000 0.00 0.0000 71.430 0.000
31 0.00000 4.54925 1.000000 0.00 0.0000 34.330 0.000
32 -94.68231 1.80000 1.816000 46.62 0.5568 32.768 -40.722
33 52.04362 5.73792 1.808095 22.76 0.6307 32.171 59.938
34 -778.81851 7.60591 1.000000 0.00 0.0000 31.862 0.000
35 -28.66765 1.49977 1.816000 46.62 0.5568 31.165 -27.013
36 99.82643 9.78155 1.548141 45.79 0.5685 34.570 41.833
37 -28.92570 16.01920 1.000000 0.00 0.0000 35.816 0.000
38 199.34821 6.70092 1.531717 48.84 0.5630 38.819 70.702
39 -46.06345 1.49225 1.000000 0.00 0.0000 38.842 0.000
40 -100.22501 1.50000 1.882997 40.76 0.5667 36.719 -38.292
41 51.83775 8.48732 1.518229 58.90 0.5456 36.172 48.039
42 -45.56870 1.00004 1.000000 0.00 0.0000 36.281 0.000
43 143.58790 8.50167 1.496999 81.54 0.5374 34.219 60.624
44 -37.51907 1.50000 1.882997 40.76 0.5667 33.064 -45.656
45 -511.58948 1.00125 1.000000 0.00 0.0000 32.878 0.000
46 74.36478 5.81334 1.522494 59.84 0.5439 32.490 78.431
47 -89.61862 10.00000 1.000000 0.00 0.0000 31.878 0.000
48 0.00000 33.00000 1.608590 46.44 0.5664 40.000 0.000
49 0.00000 13.20000 1.516330 64.14 0.5352 40.000 0.000
50 0.00000 0.00000 1.000000 0.00 0.0000 50.000 0.000

Aspheric data 15th surface
K = -9.17148e + 002 A 4 = 8.97349e-007 A 6 = -3.36416e-010 A 8 = 8.18022e-014
22nd page
K = -5.34644e + 000 A 4 = -1.44820e-007 A 6 = 6.38150e-012 A 8 = 2.42371e-016

Various data Zoom ratio 80.00
Wide angle Medium Telephoto focal length 10.00 89.43 800.00
F number 1.79 1.80 4.20
Angle of view 28.81 3.52 0.39
Image height 5.50 5.50 5.50
Total lens length 677.58 677.58 677.58
BF 14.94 14.94 14.94
d14 3.00 140.38 178.51
d21 284.99 114.84 3.16
d30 5.30 38.07 111.62
d50 14.94 14.94 14.94
Entrance pupil position 166.55 990.97 9682.89
Exit pupil position -2390.11 -2390.11 -2390.11
Front principal point position 176.50 1077.08 10216.78
Rear principal point position 4.94 -74.49 -785.06

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 247.00 152.35 94.45 -20.43
2 15 -29.86 28.64 4.81 -15.77
3 22 77.98 49.15 9.69 -24.48
4 31 63.69 139.19 62.04 7.12

(Numerical example 4)
Unit mm
Surface data Surface number rd nd vd θgF Effective diameter Focal length
1 540.51891 6.00000 1.854780 24.80 0.6122 204.916 -1023.079
2 333.53068 2.44610 1.000000 0.00 0.0000 197.511 0.000
3 354.54790 17.42717 1.433870 95.10 0.5373 196.541 812.102
4 -93758.76385 0.20000 1.000000 0.00 0.0000 194.228 0.000
5 1909.26865 6.00000 1.639999 60.08 0.5370 191.536 -620.926
6 329.60361 4.69068 1.000000 0.00 0.0000 187.583 0.000
7 407.56060 14.50916 1.433870 95.10 0.5373 188.171 907.832
8 -12544.99821 45.79065 1.000000 0.00 0.0000 188.323 0.000
9 326.40246 19.33977 1.433870 95.10 0.5373 192.153 685.684
10 -3395.16984 0.25000 1.000000 0.00 0.0000 191.653 0.000
11 234.85405 20.84581 1.433870 95.10 0.5373 186.846 602.215
12 2210.13952 1.20000 1.000000 0.00 0.0000 185.428 0.000
13 202.41101 12.37011 1.496999 81.54 0.5374 174.594 840.897
14 383.48455 (variable) 1.000000 0.00 0.0000 172.897 0.000
15 457.43359 2.35000 1.882997 40.76 0.5667 49.711 -50.888
16 41.03229 14.54481 1.000000 0.00 0.0000 42.871 0.000
17 -55.72869 1.45000 1.772499 49.60 0.5521 39.618 -39.753
18 69.92511 9.21164 1.808095 22.76 0.6307 40.991 42.019
19 -63.35971 1.69693 1.000000 0.00 0.0000 41.800 0.000
20 -48.05236 2.00000 1.696797 55.53 0.5433 41.801 -82.817
21 -286.06046 (variable) 1.000000 0.00 0.0000 44.111 0.000
22 374.72769 8.00938 1.603112 60.64 0.5414 74.990 204.605
23 -183.57781 0.98756 1.000000 0.00 0.0000 75.711 0.000
24 168.50932 12.54292 1.438750 94.93 0.5343 77.680 190.177
25 -162.33229 0.51071 1.000000 0.00 0.0000 77.670 0.000
26 225.78128 2.50000 1.749505 35.33 0.5818 75.771 -202.099
27 90.58423 8.02203 1.438750 94.93 0.5343 73.805 285.347
28 316.71179 (variable) 1.000000 0.00 0.0000 73.472 0.000
29 125.63978 2.50000 1.846660 23.78 0.6205 72.702 -262.011
30 79.75788 14.23865 1.593490 67.00 0.5361 70.895 111.450
31 -369.39822 (variable) 1.000000 0.00 0.0000 69.910 0.000
32 0.00000 4.90749 1.000000 0.00 0.0000 33.144 0.000
33 -72.13544 1.80000 1.816000 46.62 0.5568 31.569 -39.850
34 60.43089 5.13557 1.808095 22.76 0.6307 31.252 59.455
35 -237.28216 7.55722 1.000000 0.00 0.0000 31.109 0.000
36 -28.78125 1.49977 1.816000 46.62 0.5568 30.321 -24.953
37 72.49578 10.08032 1.548141 45.79 0.5685 33.671 38.544
38 -28.55262 16.01812 1.000000 0.00 0.0000 34.966 0.000
39 194.31854 9.07524 1.531717 48.84 0.5630 38.490 68.490
40 -44.35136 1.49161 1.000000 0.00 0.0000 38.601 0.000
41 -104.49421 1.50000 1.882997 40.76 0.5667 36.367 -38.029
42 50.24421 8.69548 1.518229 58.90 0.5456 35.769 45.865
43 -42.76309 0.49453 1.000000 0.00 0.0000 35.868 0.000
44 151.55145 6.51018 1.496999 81.54 0.5374 33.699 59.851
45 -36.61436 1.50000 1.882997 40.76 0.5667 33.149 -44.960
46 -449.26887 1.00055 1.000000 0.00 0.0000 32.904 0.000
47 79.39231 5.73260 1.522494 59.84 0.5439 32.441 83.644
48 -95.65061 10.00000 1.000000 0.00 0.0000 31.774 0.000
49 0.00000 33.00000 1.608590 46.44 0.5664 40.000 0.000
50 0.00000 13.20000 1.516330 64.14 0.5352 40.000 0.000
51 0.00000 0.00000 1.000000 0.00 0.0000 50.000 0.000

Aspheric data 15th surface
K = -5.67078e + 002 A 4 = 1.45820e-006 A 6 = -8.19984e-010 A 8 = 4.57496e-013
22nd page
K = -2.72744e + 001 A 4 = -1.02316e-007 A 6 = -2.24758e-012 A 8 = -1.15884e-016

Various data Zoom ratio 80.00
Wide angle Medium Telephoto focal length 10.00 89.46 800.00
F number 1.80 1.80 4.20
Angle of view 28.81 3.52 0.39
Image height 5.50 5.50 5.50
Total lens length 683.42 683.42 683.42
BF 14.96 14.96 14.96
d14 2.65 136.75 177.42
d21 276.48 107.28 4.73
d28 13.66 9.62 8.25
d31 4.83 43.97 107.23
d51 14.96 14.96 14.96
Entrance pupil position 172.72 994.11 10385.21
Exit pupil position 8182.06 8182.06 8182.06
Front principal point position 182.73 1084.54 11263.57
Rear principal point position 4.96 -74.49 -785.03

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 247.00 151.07 96.10 -23.17
2 15 -27.89 31.25 6.69 -16.09
3 22 114.48 32.57 4.01 -17.95
4 29 194.98 16.74 2.39 -8.02
5 32 60.17 139.20 60.62 7.45

(Numerical example 5)
Unit mm
Surface data Surface number rd nd vd θgF Effective diameter Focal length
1 2436.20797 6.00000 1.639999 60.08 0.5370 207.998 -549.495
2 308.08263 1.60986 1.000000 0.00 0.0000 198.320 0.000
3 314.66392 18.64663 1.433870 95.10 0.5373 197.902 760.546
4 6332.28838 0.20000 1.000000 0.00 0.0000 196.364 0.000
5 603.08886 6.00000 1.854780 24.80 0.6122 192.014 -1102.556
6 367.40990 2.72065 1.000000 0.00 0.0000 190.412 0.000
7 393.10907 16.12824 1.433870 95.10 0.5373 190.991 816.634
8 -3637.88082 38.93074 1.000000 0.00 0.0000 191.144 0.000
9 321.03306 22.28825 1.433870 95.10 0.5373 193.803 627.474
10 -1782.98914 0.25000 1.000000 0.00 0.0000 193.066 0.000
11 285.32034 18.64551 1.433870 95.10 0.5373 187.904 706.555
12 3906.23867 1.20000 1.000000 0.00 0.0000 186.366 0.000
13 183.98953 13.15182 1.496999 81.54 0.5374 174.012 896.076
14 305.43046 (variable) 1.000000 0.00 0.0000 171.437 0.000
15 370.39834 2.35000 1.882997 40.76 0.5667 51.444 -61.390
16 47.38567 15.03937 1.000000 0.00 0.0000 44.955 0.000
17 -60.04212 1.45000 1.772499 49.60 0.5521 40.012 -36.883
18 55.29844 8.83280 1.808095 22.76 0.6307 39.213 39.663
19 -72.53083 1.58631 1.000000 0.00 0.0000 39.352 0.000
20 -52.23934 2.00000 1.696797 55.53 0.5433 39.307 -64.902
21 353.26772 (variable) 1.000000 0.00 0.0000 41.065 0.000
22 557.43254 10.67333 1.603112 60.64 0.5414 75.688 198.321
23 -151.94456 0.94219 1.000000 0.00 0.0000 77.124 0.000
24 156.10343 11.08587 1.438750 94.93 0.5343 79.115 225.538
25 -266.26098 0.45930 1.000000 0.00 0.0000 79.005 0.000
26 221.02580 2.50000 1.749505 35.33 0.5818 77.728 -182.001
27 84.28843 9.18283 1.438750 94.93 0.5343 75.648 260.668
28 307.64854 (variable) 1.000000 0.00 0.0000 75.386 0.000
29 126.06342 2.50000 1.846660 23.78 0.6205 75.169 -316.687
30 85.23121 16.00701 1.593490 67.00 0.5361 73.603 112.475
31 -291.09108 (variable) 1.000000 0.00 0.0000 72.500 0.000
32 0.00000 4.90749 1.000000 0.00 0.0000 33.107 0.000
33 -72.13544 1.80000 1.816000 46.62 0.5568 31.542 -39.850
34 60.43089 5.13557 1.808095 22.76 0.6307 31.235 59.455
35 -237.28216 7.55722 1.000000 0.00 0.0000 31.097 0.000
36 -28.78125 1.49977 1.816000 46.62 0.5568 30.322 -24.953
37 72.49578 10.08032 1.548141 45.79 0.5685 33.684 38.544
38 -28.55262 16.01812 1.000000 0.00 0.0000 34.979 0.000
39 194.31854 9.07524 1.531717 48.84 0.5630 38.558 68.490
40 -44.35136 1.49161 1.000000 0.00 0.0000 38.674 0.000
41 -104.49421 1.50000 1.882997 40.76 0.5667 36.439 -38.029
42 50.24421 8.69548 1.518229 58.90 0.5456 35.845 45.865
43 -42.76309 0.49453 1.000000 0.00 0.0000 35.944 0.000
44 151.55145 6.51018 1.496999 81.54 0.5374 33.774 59.851
45 -36.61436 1.50000 1.882997 40.76 0.5667 33.233 -44.960
46 -449.26887 1.00055 1.000000 0.00 0.0000 32.994 0.000
47 79.39231 5.73260 1.522494 59.84 0.5439 32.536 83.505
48 -95.29566 10.00000 1.000000 0.00 0.0000 31.877 0.000
49 0.00000 33.00000 1.608590 46.44 0.5664 40.000 0.000
50 0.00000 13.20000 1.516330 64.14 0.5352 40.000 0.000
51 0.00000 0.00000 1.000000 0.00 0.0000 50.000 0.000

Aspheric data 15th surface
K = -2.83227e + 002 A 4 = 1.27013e-006 A 6 = -5.69599e-010 A 8 = 3.15356e-013
22nd page
K = -1.31199e + 002 A 4 = -2.47168e-008 A 6 = -1.51931e-011 A 8 = 2.47286e-015

Various data Zoom ratio 80.00
Wide angle Medium Telephoto focal length 10.00 89.42 800.00
F number 1.80 1.80 4.20
Angle of view 28.81 3.52 0.39
Image height 5.50 5.50 5.50
Total lens length 698.44 698.44 698.44
BF 15.16 15.16 15.16
d14 3.00 143.45 181.96
d21 281.16 115.58 14.93
d28 24.13 7.35 1.48
d31 5.41 47.33 115.33
d51 15.16 15.16 15.16
Entrance pupil position 166.83 1085.00 10843.19
Exit pupil position 6999.93 6999.93 6999.93
Front principal point position 176.84 1175.57 11734.82
Rear principal point position 5.16 -74.26 -784.84

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 252.00 145.77 88.51 -22.57
2 15 -26.50 31.26 9.25 -12.90
3 22 126.28 34.84 3.87 -19.27
4 29 174.93 18.51 3.37 -8.21
5 32 60.04 139.20 60.56 7.35

U1 1st lens group U2 2nd lens group U3 3rd lens group U4 4th lens group U5 5th lens group SP Aperture stop IP Image surface

Claims (9)

In order from the object side to the image side, a first lens unit having a positive refractive power that does not move for zooming, a second lens unit having a negative refractive power that moves during zooming, and a third lens having a positive refractive power that moves during zooming. In a zoom lens having a lens group,
The distance between adjacent lens groups changes during zooming,
The first lens group includes a 1a lens group that does not move for focusing, and a 1b lens group that moves from the image side to the object side during focusing from an object at infinity to a near object,
The zoom lens according to claim 1, wherein the first lens group has two positive lenses and two negative lenses.   In order from the object side to the image side, the first lens group, the second lens group, the third lens group, a fourth lens group having a positive refractive power that moves during zooming, and a fifth lens group that does not move for zooming. The zoom lens according to claim 1, comprising a lens group.   The first lens group, the second lens group, the third lens group, and a fourth lens group that does not move for zooming are arranged in order from the object side to the image side. The described zoom lens. Of the two negative lenses in the lens group 1a, the focal length of the negative lens arranged on the object side is fn1, the Abbe number is νn1, the focal length of the negative lens arranged on the image side is fn2, and the Abbe When the number is νn2,
0.30 <fn1 / fn2 <2.50
0.30 <νn1 / νn2 <2.70
The zoom lens according to claim 1, wherein the following condition is satisfied.
However, the Abbe number is expressed as follows, where the refractive index in the F line is NF, the refractive index in the d line is Nd, and the refractive index in the C line is NC.
νd = (Nd−1) / (NF−NC) Of the two negative lenses in the 1a lens group, the focal length of the negative lens arranged on the object side is fn1, the focal length of the negative lens arranged on the image side is fn2, and the focal length of the first lens group Is f1,
1.30 <| fn1 / f1 | <5.00
1.50 <| fn2 / f1 | <6.00
The zoom lens according to claim 1, wherein the following condition is satisfied. Among the lenses constituting the 1a lens group, the Abbe number of the positive lens and the average value of the partial dispersion ratio are νpa and θpa, and among the negative lenses constituting the 1a lens group, the negative lens having the largest Abbe number When Abbe number and partial dispersion ratio are νnx and θnx,
−0.50500 × 10 ⁻³ <(θpa−θnx) / (νpa−νnx) <0.20000 × 10 ⁻³
The zoom lens according to claim 1, wherein the zoom lens is a zoom lens.
However, the partial dispersion ratio is expressed as follows when the refractive index at the g-line is Ng.
θ = (Ng−NF) / (NF−NC) When the focal length of the first lens group is f1, and the focal length of the second lens group is f2,
6.00 <| f1 / f2 | <13.00
The zoom lens according to claim 1, wherein the following condition is satisfied. When the focal length of the first lens group is f1, the combined focal length of the positive lens among the lenses constituting the first a lens group is fpa, and the combined focal length of the negative lens is fna,
0.75 <| fna / fpa | <1.30
1.00 <| fna / f1 | <2.00
1.00 <| fpa / f1 | <2.20
The zoom lens according to claim 1, wherein the following condition is satisfied.
However, the combined focal length fx of the plurality of lenses is expressed as follows when the focal lengths of the plurality of lenses are f1, f2, f3.
1 / fx = 1 / f1 + 1 / f2 + 1 / f3 +...   An image pickup apparatus comprising: the zoom lens according to claim 1; and a solid-state image pickup device that receives an image formed by the zoom lens.

Images